Ultrastructure of the Dorsal Neurohemal Area of the Snail Theba pisana L. (Stylommatophora, Gastropoda)

摘要: In most species of Stylommatophora that have been investigated, two or rarely three small nerves extend from the cerebral commissure and branch out within dispersed dorsal body (DB). This neurohemal area lateral areas belong to peptidergic system ganglia (KUHLMANN, 1963, 1966; NOTTE, 1965, 1968; VAN MOL, 1967). No electronmicroscopic investigations this in published until now (see MARTOJA, 19 72; BOER JOOSSE, 1975). Theba pisana, a hermaphroditic xerophilous landsnail, seems adequate for an ultrastructural examination supposed morphologic connection between neurosecretory (NOLTE, 1965). has well-developed PAF-positive (CCNs) DB lying at clear distance so close contact these tissues (CCNs DB) cannot only be due chance.